Diamond decorative bulb shell



FIG. 1 is a perspective view of a diamond decorative bulb shell showing my new design;

FIG. 2 is a side elevational view thereof, with the opposite sides being a mirror image;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a diamond decorative bulb shell, as shown and described. 